diff --git a/Core/Src/main.c b/Core/Src/main.c
index 60cb4b1..f1690ba 100644
--- a/Core/Src/main.c
+++ b/Core/Src/main.c
@@ -172,7 +172,7 @@ static void MX_USART1_UART_Init(void)
   /* USER CODE END USART1_Init 1 */
   huart1.Instance = USART1;
   huart1.Init.BaudRate = 115200;
-  huart1.Init.WordLength = UART_WORDLENGTH_8B;
+  huart1.Init.WordLength = UART_WORDLENGTH_9B;
   huart1.Init.StopBits = UART_STOPBITS_1;
   huart1.Init.Parity = UART_PARITY_EVEN;
   huart1.Init.Mode = UART_MODE_TX_RX;
diff --git a/Modbus.ioc b/Modbus.ioc
index 2fc1603..741888e 100644
--- a/Modbus.ioc
+++ b/Modbus.ioc
@@ -131,9 +131,10 @@ RCC.VCOI2SOutputFreq_Value=192000000
 RCC.VCOInputFreq_Value=1000000
 RCC.VCOOutputFreq_Value=336000000
 RCC.VcooutputI2S=96000000
-USART1.IPParameters=VirtualMode,Parity
+USART1.IPParameters=VirtualMode,Parity,WordLength
 USART1.Parity=PARITY_EVEN
 USART1.VirtualMode=VM_ASYNC
+USART1.WordLength=WORDLENGTH_9B
 USB_DEVICE.CLASS_NAME_FS=CDC
 USB_DEVICE.IPParameters=VirtualMode-CDC_FS,VirtualModeFS,CLASS_NAME_FS
 USB_DEVICE.VirtualMode-CDC_FS=Cdc